Cation insertion to break the activity/stability relationship for highly active oxygen evolution reaction catalyst

Chunzhen Yang, Gwenaëlle Rousse, Katrine Louise Svane, Paul E. Pearce, Artem M. Abakumov, Michael Deschamps, Giannantonio Cibin, Alan V. Chadwick, Daniel Alves Dalla Corte, Heine Anton Hansen, Tejs Vegge, Jean-Marie Tarascon and Alexis Grimaud ()
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Chunzhen Yang: Collège de France
Gwenaëlle Rousse: Collège de France
Katrine Louise Svane: Technical University of Denmark
Paul E. Pearce: Collège de France
Artem M. Abakumov: Skolkovo Institute of Science and Technology
Michael Deschamps: CNRS FR 3459,33 rue Saint Leu
Giannantonio Cibin: Harwell Science and Innovation Campus
Alan V. Chadwick: University of Kent
Daniel Alves Dalla Corte: Collège de France
Heine Anton Hansen: Technical University of Denmark
Tejs Vegge: Technical University of Denmark
Jean-Marie Tarascon: Collège de France
Alexis Grimaud: Collège de France

Nature Communications, 2020, vol. 11, issue 1, 1-10

Abstract: Abstract The production of hydrogen at a large scale by the environmentally-friendly electrolysis process is currently hampered by the slow kinetics of the oxygen evolution reaction (OER). We report a solid electrocatalyst α-Li2IrO3 which upon oxidation/delithiation chemically reacts with water to form a hydrated birnessite phase, the OER activity of which is five times greater than its non-reacted counterpart. This reaction enlists a bulk redox process during which hydrated potassium ions from the alkaline electrolyte are inserted into the structure while water is oxidized and oxygen evolved. This singular charge balance process for which the electrocatalyst is solid but the reaction is homogeneous in nature allows stabilizing the surface of the catalyst while ensuring stable OER performances, thus breaking the activity/stability tradeoff normally encountered for OER catalysts.

Date: 2020
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DOI: 10.1038/s41467-020-15231-x

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